The Party System advocates the adoption of proportional representation as the best method "of ensuring that every substantial body of political opinion in the country should be repre- sented in proportion to its strength.0 "It is only," he writes, "on the basis of the security and stability which proportional representation can alone secure that free and responsible criticism can be carried on."1 The argument is, obviously, both able and persuasive; I yet believe it to be wholly erroneous. There is no evi- dence that the prestige of the legislature is higher in countries like France, where the group-system obtains, than it is with ourselves; on the contrary, the deputy's freedom of manoeuvre tends to discredit any Govern- ment by making it uncertain of the steady allegiance upon which alone a great programme can be carried through. The "significant and constantly recurring trend towards a three-party system" in Great Britain has, the abnor- mality of the Irish Party apart, occurred exactly twice in the last hundred years; it occurred in.the thirty years of confusion after 1832 when the modern Liberal and Conservative parties were emerging from the political con- figuration of the pre-reform epoch; and it occurred again, slowly from 1906 to 1918, and more rapidly afterwards, when the emergence of Socialism as a new principle of political action in this country was re-shaping fundamen- tally the whole orientation of our politics. Since approval or disapproval of Socialism is now the real issue before the electorate, it is natural for the division of parties to turn upon their attitude to its principles. A centre party, such as Mr. Muir desires, naturally disapproves of such an evolution since, granted our system of voting, it tends to disappear between the two bodies who present the electorate with a definite and decisive choice. 1 Hew Britain it Governed (1930), Chapters IV and V, 77